A bit OT but does apply to falling leaners:
On a badly leaning tree, there is a heightened risk of a 'barberchair'. Several years ago I learned to place a heavy log chain around the stem above the cut before beginning. It saved my rear 2 days ago. Tree 34" DBH, buckskin on bottom, looked solid, chips coming from the notch were solid but...I barely started the back cut when the tree cracked taking all the slack out of the chain. A little more cutting and it was on the ground. Turned out that the undercut side was solid, the back side half rotten. When I removed the chain there was a 360 degree perfect pattern of chain link indentations. That would have been one spectacular barber chair without the safety chain
Harry K